diff --git a/eos/effects/capacitorcapacitymultiply.py b/eos/effects/capacitorcapacitymultiply.py
index 4b277a8da..8b5df217d 100644
--- a/eos/effects/capacitorcapacitymultiply.py
+++ b/eos/effects/capacitorcapacitymultiply.py
@@ -10,4 +10,6 @@ type = "passive"
 
 
 def handler(fit, module, context):
-    fit.ship.multiplyItemAttr("capacitorCapacity", module.getModifiedItemAttr("capacitorCapacityMultiplier"))
+    # We default this to None as there are times when the source attribute doesn't exist (for example, Cap Power Relay).
+    # It will return 0 as it doesn't exist, which would nullify whatever the target attribute is
+    fit.ship.multiplyItemAttr("capacitorCapacity", module.getModifiedItemAttr("capacitorCapacityMultiplier", None))
diff --git a/eos/effects/poweroutputmultiply.py b/eos/effects/poweroutputmultiply.py
index 3a0e5c6a1..f4d5eb600 100644
--- a/eos/effects/poweroutputmultiply.py
+++ b/eos/effects/poweroutputmultiply.py
@@ -9,4 +9,6 @@ type = "passive"
 
 
 def handler(fit, module, context):
-    fit.ship.multiplyItemAttr("powerOutput", module.getModifiedItemAttr("powerOutputMultiplier"))
+    # We default this to None as there are times when the source attribute doesn't exist (for example, Cap Power Relay).
+    # It will return 0 as it doesn't exist, which would nullify whatever the target attribute is
+    fit.ship.multiplyItemAttr("powerOutput", module.getModifiedItemAttr("powerOutputMultiplier", None))
diff --git a/eos/effects/shieldcapacitymultiply.py b/eos/effects/shieldcapacitymultiply.py
index 71c91f19e..3c9aeea6d 100644
--- a/eos/effects/shieldcapacitymultiply.py
+++ b/eos/effects/shieldcapacitymultiply.py
@@ -9,4 +9,6 @@ type = "passive"
 
 
 def handler(fit, module, context):
-    fit.ship.multiplyItemAttr("shieldCapacity", module.getModifiedItemAttr("shieldCapacityMultiplier"))
+    # We default this to None as there are times when the source attribute doesn't exist (for example, Cap Power Relay).
+    # It will return 0 as it doesn't exist, which would nullify whatever the target attribute is
+    fit.ship.multiplyItemAttr("shieldCapacity", module.getModifiedItemAttr("shieldCapacityMultiplier", None))